Double end mill



FIG. 1 is a perspective view of the double end mill showing my new design view;

FIG. 2 is a front elevational view of FIG. 1;

FIG. 3 is a rear side elevational view of FIG. 1;

FIG. 4 is a left side elevational view of FIG. 1;

FIG. 5 is a right side elevational view of FIG. 1;

FIG. 6 is a top plan view of FIG. 1;

FIG. 7 is a bottom plan view of FIG. 1; and,

FIG. 8 is an enlarged top plan view of FIG. 1. 

CLAIM The ornamental design for the double end mill, as shown and described. 